Acta Cryst. (1971).A27, 65-67
https://doi.org/10.1107/S0567739471000123

The site symmetry at the antimony in NaSbF₆ has been examined by nuclear magnetic resonance. Antimony-123 resonance in polycrystalline NaSbF₆ at 12.2 Mc. sec^-1 and 19°C shows no second-order quadrupole effects. This is a reflection of a negligibly small or zero deformation fromO_h symmetry of the surrounding atoms. Because of this and other considerations, NaSbF₆ belongs to the space groupFm3m within the limits established by this work. Antimony-121 resonance in KSbF₆, a compound for which the deformation fromO_h symmetry is presumably known, exhibits a second order quadrupole effect which leads to a coupling constante²qQ/h of 6.1 ± 0.6 Mc. sec^-1. A comparison of the data for the two compounds leands to an upper limit for the SbF^-₆ deformation of 7 × 10^-4 rad in NaSbF₆.